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Performing Exams Probe Usage in Scanning
Probe Usage
in Scanning
The Accutome B-Scan Plus provides every feature
needed to get high quality, accurate scans. You can
place the probe at any angle, on any elevation on the
patient eye and always capture a clear image.
How the B-Scan Probe Works
The Accutome B-Scan Plus probe is an ultrasonic probe
and sends a sound wave through the eye being
scanned. As the sound wave travels through the various
eye tissues the sound wave bounces off these tissues
and produces an echo of varying amplitude determined
by the density of the tissue. The denser the tissue the
larger the echo and the greater the signal that is
returned. Greater tissue density and a stronger echo
show up as a brighter spot in the image.
A-Scan is a thin, parallel sound beam passing through a
small
point within the eye. The echoes received back as
the signal passes through the various eye tissues are
represented by spikes arising from a baseline. A-Scan is
therefore an Amplitude scan. B-Scan is an oscillating A-
Scan passing through a slice of tissue rather than a point
and the echoes that are received back represent dots
that form an image. The higher the density of tissue that
the B-Scan wave hits will be returned as a stronger echo,
or brighter dot in the image. B-Scan is therefore a
Brightness scan. For example, the retina is a highly
dense, smooth surface and when scanned the image
returned will be bright as shown in Figure 88 on page
110.
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